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Finding the Fourth Proportional to 88.18, 121.70 and 63.70

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Solution

The fourth proportional to 88.18, 121.70 and 63.70 is: 87.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    88.18 : 121.70 = 63.70 : x
  2. Step 2: Convert to fraction form
    88.18/121.70 = 63.70/x
  3. Step 3: Cross multiply
    88.18x = 121.70 × 63.70
  4. Step 4: Simplify right side
    88.18x = 7,752.29
  5. Step 5: Solve for x
    x = 7,752.29/88.18
  6. Step 6: Final answer
    x = 87.91

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.